The Silverlight installer incorrectly identifies the Intel N270 Atom as a PowerPC chip. Fortunately there is a work around described in the howto below:
- Download Silverlight.
- Open the Silverlight.dmg file and copy Silverlight.3.0.pkg to another directory such as ~/Downloads
- Using terminal remove the InstallationCheck:
sudo rm ~/Downloads/Silverlight.3.0.pkg/Contents/Resources/InstallationCheckAfter that, double click on the SilverLight.3.0.pkg and follow the installation instructions as usual.